You've heard of flying solo, but now singles have the option to cruise solo. Not that they didn't have the opportunity to do so before, but single travelers typically have to pay 150 to 200 percent more than globetrotting duos. Luckily, cruise lines are stopping their discriminatory practice of singling out singles and making it much more affordable for someone to hit the seas all by him or herself.

Check out three cruise lines that are helping out all the single ladies and lads.

Personal Butler. That's almost a dirty phrase nowadays. But SilverSea Cruises is not concerned about that. The cruise line has just announced that it will shortly feature butlers for all types of guests accommodations on all of its ships.

According to Christian Sauleau, executive vice president of fleet operations for Silversea:

Each butler, assisted by a suite attendant, is empowered to troubleshoot problems and provide special service touches, if desired by the guest -- for example unpacking and packing clothing, facilitating a dry cleaning request or preparing a scented Jacuzzi bath -- ultimately creating a suite environment where one can relax and feel totally cared for.